1681403 has 2 divisors, whose sum is σ = 1681404. Its totient is φ = 1681402.

The previous prime is 1681397. The next prime is 1681411. The reversal of 1681403 is 3041861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681403 is a prime.

It is not a weakly prime, because it can be changed into another prime (1681423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840701 + 840702.

It is an arithmetic number, because the mean of its divisors is an integer number (840702).

2^1681403 is an apocalyptic number.

1681403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681403 is an equidigital number, since it uses as much as digits as its factorization.

1681403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 1681403 is about 1296.6892457331. The cubic root of 1681403 is about 118.9115223971.

The spelling of 1681403 in words is "one million, six hundred eighty-one thousand, four hundred three".